Satan was the god of that world (during the time of Old Covenant Israel), and

Christ is the God of this world (New Eternal Covenant Israel, i.e., believers).

The Apostle Paul referred to Satan as "the god of this world (kosmos)" during the transitional 40-year period -- from Jesus' crucifixion to the destruction of the Old Covenant in 70 A.D. He should not, however, be confused with the God of Israel! Context, context, context.

Now, we look back and see who the god of thatworld was: Satan.

But today we know that Christ is King, the God of this world!

Preterist Newbie Disclaimer: If I am wrong in explaining or understanding my position, which I am clumsily defining all the time, I apologize. Heresy is not my goal.